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The effective interest rate ( EIR ), effective annual interest rate, annual equivalent rate ( AER) or simply effective rate is the percentage of interest on a loan or financial product if compound interest accumulates in periods different than a year. [ 1] It is the compound interest payable annually in arrears, based on the nominal interest rate.
An amortization schedule is a table detailing each periodic payment on an amortizing loan (typically a mortgage ), as generated by an amortization calculator. [ 1] Amortization refers to the process of paying off a debt (often from a loan or mortgage) over time through regular payments. [ 2] A portion of each payment is for interest while the ...
The denominator of a Rule of 78s loan is the sum of the integers between 1 and n, inclusive, where n is the number of payments. For a twelve-month loan, the sum of numbers from 1 to 12 is 78 (1 + 2 + 3 + . . . +12 = 78). For a 24-month loan, the denominator is 300. The sum of the numbers from 1 to n is given by the equation n * (n+1) / 2.
Annual percentage rate. Parts of total cost and effective APR for a 12-month, 5% monthly interest, $100 loan paid off in equally sized monthly payments. The term annual percentage rate of charge ( APR ), [ 1][ 2] corresponding sometimes to a nominal APR and sometimes to an effective APR ( EAPR ), [ 3] is the interest rate for a whole year ...
In finance, an interest rate cap is a type of interest rate derivative in which the buyer receives payments at the end of each period in which the interest rate exceeds the agreed strike price. An example of a cap would be an agreement to receive a payment for each month the LIBOR rate exceeds 2.5%. Similarly, an interest rate floor is a ...
Actuarial notation is a shorthand method to allow actuaries to record mathematical formulas that deal with interest rates and life tables . Traditional notation uses a halo system, where symbols are placed as superscript or subscript before or after the main letter. Example notation using the halo system can be seen below.
In finance, the weighted-average life (WAL) of an amortizing loan or amortizing bond, also called average life, [ 1][ 2][ 3] is the weighted average of the times of the principal repayments: it's the average time until a dollar of principal is repaid. In a formula, [ 4] where: is the time (in years) from the calculation date to payment . If ...
In finance, the rule of 72, the rule of 70[ 1] and the rule of 69.3 are methods for estimating an investment 's doubling time. The rule number (e.g., 72) is divided by the interest percentage per period (usually years) to obtain the approximate number of periods required for doubling. Although scientific calculators and spreadsheet programs ...